C / C++ / MFC Discussion Boards

Re: Draw on screen outside application window

_AnsHUMAN_ 24-Jun-08 0:04

24-Jun-08 0:04

On similar lines as the answer you received above you can get a dc for the desktop window HWND. The desktop window hwnd can be obtained by GetDesktopWindow API

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: Draw on screen outside application window

Jijo.Raj24-Jun-08 1:22

Jijo.Raj

24-Jun-08 1:22

Such application are not drawing directly to desktop. They take snapshot of desktop and draw effects on it. So that on exit of you're application, you're desktop will be as clean as before.

Check this article - http://www.codeguru.com/cpp/g-m/multimedia/desktopeffects/article.php/c4719/[^]

Roll eyes | :rolleyes:

regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Re: Draw on screen outside application window

garyofcourse24-Jun-08 3:54

garyofcourse

24-Jun-08 3:54

Thanks a lot jijo. The article you have linked me to is just what i needed.

Re: Draw on screen outside application window

Jijo.Raj24-Jun-08 7:45

Jijo.Raj

24-Jun-08 7:45

garyofcourse wrote:
Thanks a lot jijo.

Always Welcome! Wink | ;)

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Socket Ping vs Connect Performance

od@ananzi.co.za23-Jun-08 23:16

od@ananzi.co.za

23-Jun-08 23:16

Hi All,

We have quite about 30 clients connecting to about 200 servers on our WAN. Currently we are experiencing extremely slow connection establishment times, in the order of 15-20 seconds. However, a ping from a client to the same server responds in 1-2 seconds.

The client and server applications are based on WSASocket.

I have traced the client and server side applications to death and it seams that the delay is in the receiving of the FD_ACCEPT event. Once the event has been received and the connections established, all seems fine, but it takes an unusually long time for the event to be received (through WSAEnumNetworkEvents).

Are there any reasons for the connection establishment to take SOOOO long, while a ping goes through quite quickly ?

Thanks
OD

Re: Socket Ping vs Connect Performance

Moak6-Jul-08 4:51

Moak

6-Jul-08 4:51

Sounds strange, maybe your routers do some traffic shaping or you hit a bottleneck in your network infrastructure. I would try to send more dummy data with the connection handshake (to see if that has a negative or positive impact), plus try another listening port number.

/M

My Webchat in Europe Java | [Coffee]

file association question in MDI , about dde

followait23-Jun-08 22:56

followait

23-Jun-08 22:56

I can't start the MDI application by dbclick a data file.
It reports that the file can't be found, and crashes.
I check the registry, and found:

open
 |
 |---command
 |   Default d:\myapp.exe /dde
 |---ddeexec
     Default [open("%1")]

I tried to change it as below:

open
 |
 |---command
     Default d:\myapp.exe "%1"

the problem is solved, but when I open a data file the second time, the registry is restored automatically.

What's dde? How to make it correct?

About CreateProcessAsUser

hanlei000000000923-Jun-08 22:13

hanlei0000000009

23-Jun-08 22:13

HANDLE   hToken;  

	if(!GetTokenByName(hToken,"EXPLORER.EXE"))   
	{   
		return   FALSE;   
	}   

	STARTUPINFO   si;   
	PROCESS_INFORMATION   pi;   

	ZeroMemory(&si,   sizeof(STARTUPINFO));   
	si.cb=   sizeof(STARTUPINFO);   
	si.lpDesktop   =   TEXT("winsta0\\default");   


	BOOL   bResult   =   CreateProcessAsUser(hToken,"D:\\1.bat",NULL,NULL,NULL,   FALSE,NORMAL_PRIORITY_CLASS,NULL,lpCurrentDir,&si,&pi);

I use CreateProcessAsUser run 1.bat attach a database to sql server 2000.

1.bat:

OSQL -E -Q "sp_attach_db @dbname = 'YDJC2', @filename1 = '%CD%\database 08-6-5\YDJC2_Data.MDF', @filename2 = '%CD%\database 08-6-5\YDJC2_Log.LDF'"

But, this database is read only attribute in sql server 2000, why?

I double click mouse button to run 1.bat is OK, database is read/write attribute in sql server 2000.

How to use CreateProcessAsUser to solve this problem?

MFC DLL

bhanu_850923-Jun-08 21:14

bhanu_8509

23-Jun-08 21:14

Dear All,

I want to develop an application in VC++ as dll. Please tell me whether it is possible to access the dll from a C# GUI application. For example, I have 5 dll for five different application. In the C# GUI I have 5 buttons, clicking the button has to launch the application (dll) accordingly.

I dont know how to develop this kind of application and also dont know whether this is possible or not.

Re: MFC DLL

Cedric Moonen23-Jun-08 21:20

Cedric Moonen

23-Jun-08 21:20

bhanu_8509 wrote:
For example, I have 5 dll for five different application. In the C# GUI I have 5 buttons, clicking the button has to launch the application (dll) accordingly.

A dll is not an executable, so you can't "execute" a dll. Why don't you simply make 5 executables that you can start from C# ? I don't really understand why you want to use dll's. Or I misunderstood your question, and then some more information would be useful.

Cédric Moonen
Software developer

Charting control [v1.4]

Re: MFC DLL

bhanu_850923-Jun-08 23:13

bhanu_8509

23-Jun-08 23:13

Please kindly refer my reply.

Re: MFC DLL

Hamid_RT23-Jun-08 21:24

Hamid_RT

23-Jun-08 21:24

Do you wan to make your dlls on the c++ and use of them on the C#? yes

Re: MFC DLL

theCPkid23-Jun-08 22:26

theCPkid

23-Jun-08 22:26

>>For example, I have 5 dll for five different application?
What kind of applications are these??

You can export functions from a dll and then on every button click, you can call any function inside any dll. So, it is possible for you to make five dll and make each dlls export 1 function which you will call depending on which button is clicked.

the fruits of your success will be in direct ratio to the honesty and sincerity of your own efforts in keeping your own records, doing your own thinking and, reaching your own conclusions.
..surviving in autumn..in love with spring..

Re: MFC DLL [modified]

bhanu_850923-Jun-08 23:12

bhanu_8509

23-Jun-08 23:12

My application is for MPEG2 Transport Stream Analysis and Decoding of MPEG streams. I am developing this applications in vc++.

theCPkid wrote:
You can export functions from a dll and then on every button click, you can call any function inside any dll. So, it is possible for you to make five dll and make each dlls export 1 function which you will call depending on which button is clicked.

My dll has many functions with it, for example, I will develop the decoder as one dll. Please tell me is it possible to call the dll from the c# GUI application. Does it takes more memory during the init of the c# application ? Can we control all the functions in the dll from the c# app ?

Also advice whether to develop the decoder app as a executable and then call the exe from the c# app. Will this takes more memory while loading ?

Please kindly advice how to proceed (whether to use dll or exe).

Thank you very much. Expecting your kind reply

modified on Tuesday, June 24, 2008 7:18 AM

Re: MFC DLL

bhanu_850924-Jun-08 1:54

bhanu_8509

24-Jun-08 1:54

Can anyone help me for the above ?

Kindly,
Gaja

Re: MFC DLL

theCPkid24-Jun-08 2:19

theCPkid

24-Jun-08 2:19

DLLs are more efficient when it comes to memory usage.
See this link:
http://msdn.microsoft.com/en-us/library/dtba4t8b(VS.80).aspx

Your dll can export as many functions as it wants.
What do you mean by controlling a function? You call the function inside you dll and it will accept some input, transport stream, and gives back audio/video stream as output.

By the way, it does not matter right now whether you work on dll or exe as the decoding logic will remain same. So, you can start working on it till you get a better idea of it.

Good Luck.

Re: MFC DLL

bhanu_850925-Jun-08 1:53

bhanu_8509

25-Jun-08 1:53

Thank you very much for your reply. I have finished developing the application as MFC. Now I have MFC executable. But now I need to design a single GUI to control all the functions.

I dont develop the application as dll as of now it is available only as MFC executable. I also go through the VC++ windows application forms and found it is better for designing GUI.

Now my question is that, "Is it possible to migrate the VC++ MFC code into Windows application form". It will be very easy for me, if the above one is possible.

Please guide me. (I am only having little knowledge in Windows application forms. If I am not explaining you correctly means, please advice.)

Many thanks in advance.

Re: MFC DLL

theCPkid27-Jun-08 22:11

theCPkid

27-Jun-08 22:11

oh! I am sorry for the very late reply.

"Is it possible to migrate the VC++ MFC code into Windows application form"
> No. AFAIK, you cannot directly copy MFC code into C#. You will need to make significant changes as the two languages are different.

But you have no trouble. Just create a dll. For that, create an empty MFC dll using wizard, and then copy your mainframe, view and doc class (assuming you are using doc/view architecture in MFC application) directly into dll and write the functions you want to export in the one cpp file of dll created by wizard.

You wont need to do any changes in code to create dll. and then you can use this dll in your C# application.

Hope that helps.

Setting the wallpaper

theCPkid23-Jun-08 21:10

theCPkid

23-Jun-08 21:10

I am using IActiveDesktop:SetWallpaper function to set the wallpaper. My application generates a bitmap, say D:\image.bmp and then this image is set as wallpaper. The problem is when I edit this image.bmp and call set wallpaper again, the new picture is internally set but is not updated on desktop. I mean to display the new edited picture I need to go to properties->Desktop and then ask windows to load image again.

Is there any way to programmatically tell windows to reload the wallpaper image. I guess it just assumes that if path is same, then no need to reload the image?

Re: Setting the wallpaper

Hamid_RT23-Jun-08 21:23

Hamid_RT

23-Jun-08 21:23

I think WallpaperQ: A Wallpaper Management Tool[^] is helpfuls for you.

Re: Setting the wallpaper

theCPkid23-Jun-08 22:33

theCPkid

23-Jun-08 22:33

Hey, thanks for the useful link. The link you have given will be helpful to me in many other ways although the problem I had can be solved by passing AD_APPLY_FORCE flag to ApplyChanges function of IActiveDesktop interface. I was using AD_APPLY_ALL but it was not refreshing the desktop.

Re: Setting the wallpaper

Hamid_RT24-Jun-08 0:23

Hamid_RT

24-Jun-08 0:23

I glad my answer was helpful for you. Big Grin | :-D

Re: Setting the wallpaper

Jijo.Raj24-Jun-08 0:30

Jijo.Raj

24-Jun-08 0:30

You've to call IActiveDesktop::ApplyChanges( AD_APPLY_ALL ). For code snippet just refer this - http://weseetips.com/2008/04/27/how-to-change-the-desktop-wallpaper-programmatically/[^]

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Re: Setting the wallpaper

theCPkid24-Jun-08 2:38

theCPkid

24-Jun-08 2:38

IActiveDesktop::ApplyChanges( AD_APPLY_ALL ) alone wont do. You need to pass AD_APPLY_FORCE function to refresh the same picture. AD_APPLY_ALL do not include AD_APPLY_FORCE. Thanks for your reply.

Re: Setting the wallpaper

Jijo.Raj24-Jun-08 3:41

Jijo.Raj

24-Jun-08 3:41

ooh!

Thanks for the info!

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

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